Majalah Ilmiah UNIKOM
Vol.10 No. 1
70
H a l a m a n
III. ELEVATOR GROUP CONTROL SYSTEM
The Elevator Group Control System
In the elevator group control system,
hall call
given through buttons on the hall of the
car call
elevator by the passengers. An elevator
group control system has a pair of hall call
up hall call
down hall call
passenger presses a hall call button, an
elevator is selected by the group control
system for the passenger.
The most important task of an elevator
group control system is selecting a suitable
elevator for each passenger’s hall call (up,
down). The selection is made in order to
provide service to every floor in a building, to
minimize the time spent by passengers
waiting for service, to minimize the time
spent by passengers to move from one floor
to another, to serve as many passengers as
possible in a given time and to minimize the
power consumption. The selection method is
hall call assignment method
evaluation function
to achieve the above multiple objectives.
The function is evaluated for each elevator
and the elevator with the smallest function
value is selected. Let
be the
evaluating function for the
-th elevator,
then this function is represented with the
following formula :
h
function value is evaluated for the
-th
kn
formula,
is the estimated arrival
time of the
-th elevator (the waiting time
of the passenger when we assign the
-th
elevator for the new hall call).
is
calculated by the following formula.
In the above formula, we divide the path
stopdriveStop
means floors where hall calls and car calls
Drive
there are no calls near the floor. So if an
elevator is distant from a hall call or it is
moving opposite to the direction of the hall
call, the probability of that elevator being
assigned to the hall call decreases.
area value
area weight
is higher
when the generated hall call is nearer to the
floors where
-th elevator is going to stop.
The value of
is subtracted to adjust
the usage of energy saving effect and
represents the extent of the adjustment.
is the elevator’s status value. This
value is added to prevent selecting the
-th
elevator if there exists a special kind of call
(VIP call) or the elevator is not running.
The Area-Weight
If elevator
is going to floor
area
of elevator
for floor
is defined. When
a hall call happens in this area, our
fundamental strategy is to select
elevator
for the call. The area represents the range of
floors which can be served easily by that
elevator. The area-weight is the value to
increase the assignment probability for an
elevator which is going toward the floor
where a hall call was generated.
In general, the area is defined in the form
of a trapezoidal as shown in Figure 5. The
Muhammad Aria